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The Luminescence of K4Bi2Br10 · 4 H2O and Rb3BiBr6 Single Crystals

descriptionPublicationkeyboard_double_arrow_right Article 01 Jul 1983 English Publisher:WileyJournal:physica status solidi (b), volume 118, pages 353-361 (issn: 0370-1972, eissn: 1521-3951,

Authors: G. Blasse; C. W. M. Timmermans;

doi: 10.1002/pssb.2221180141

The Luminescence of K4Bi2Br10 · 4 H2O and Rb3BiBr6 Single Crystals

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Abstract

AbstractThe luminescence properties of K4Bi2Br10 · 4 H2O and Rb3BiBr6 are reported. Both compounds show blue luminescence at low temperatures. For Rb3BiBr6 the luminescence is ascribed to the 3P0 → 1S0 transition on the isolated Bi3+ centre, while in K4Bi2Br10 · 4 H2O the luminescence originates from the [Bi2Br10]4− dimers. The energy level diagram of the dimer centre is approached by using simple MO‐theory. The compound K4Bi2Br10 · 4 H2O shows also an emission band in the red, which is ascribed to a charge‐transfer transition. The quenching of the luminescence is caused by energy migration among the dimers in K4Bi2Br10 · 4 H2O, while in Rb3BiBr6 the luminescence is quenched via the charge‐transfer state.

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